changes in physicochemical properties ... - plant and soil

changes in physicochemical properties ... - plant and soil

Mar 26, 2021 In the production of the natural medicinal plant American ginseng, replantation typically fails due to continuous cropping obstacles. However, the cause is still not clear and needs more research. Soil samples were collected from (a) maize fields where American ginseng had never been planted, (b) fields where American ginseng had just been harvested, and (c) fields where maize had

heavy metals in contaminated soils: a review of sources

heavy metals in contaminated soils: a review of sources

Scattered literature is harnessed to critically review the possible sources, chemistry, potential biohazards and best available remedial strategies for a number of heavy metals (lead, chromium, arsenic, zinc, cadmium, copper, mercury and nickel) commonly found in contaminated soils. The principles, advantages and disadvantages of immobilization, soil washing and phytoremediation techniques

superfund sites in reuse in california | us epa

superfund sites in reuse in california | us epa

Jul 21, 2021 The manufacturing process used and generated hazardous substances, including trichloroethylene (TCE), and other organic solvents, acids, corrosives and metals. Initial investigation of soil pollution at the Signetics site began in February 1982 after detection of a leak in an underground waste solvent storage tank

biochar preparation, characterization, and adsorptive

biochar preparation, characterization, and adsorptive

This paper provides an updated review on the subjects, the available alternative to produce biochar from biomass, quantification and characterization of biochar, the adsorptive capacity for the adsorption of contaminants, and the effect of biochar addition to agricultural soils on contaminant bioavailability. The property of biochar produced is much dependent upon the composition and type of

heavy metals toxicity and the environment

heavy metals toxicity and the environment

Heavy metals are naturally occurring elements that have a high atomic weight and a density at least 5 times greater than that of water. Their multiple industrial, domestic, agricultural, medical and technological applications have led to their wide distribution in the environment; raising concerns over their potential effects on human health and the environment

nature environment & polution technology

nature environment & polution technology

Jun 02, 2021 About the Journal. The journal "Nature Environment and Pollution Technology" is a quarterly scientific research journal, devoted to broader aspects of the environment, and published in March, June, September and December in a year. It was initially published with the title of "Journal of Environment & Pollution" (ISSN: 0971-4871) from 1994 to 2001. Its name was later changed to Nature

chromium - wikipedia

chromium - wikipedia

Chromium is a chemical element with the symbol Cr and atomic number 24. It is the first element in group 6.It is a steely-grey, lustrous, hard, and brittle transition metal. Chromium is the main additive in stainless steel, to which it adds anti-corrosive properties.Chromium is also highly valued as a metal that is able to be highly polished while resisting tarnishing

enhanced biogeogenic controls on dichromate speciation in

enhanced biogeogenic controls on dichromate speciation in

Apr 15, 2020 This study significantly assesses the speciation of dichromate by biogenic agents that are inherent and self-sustaining to treat the contaminated soil. Herein, a group of bacteria exposed to high concentrations of chromium (3500 mg/L) plays a vital role as an enhanced biogeogenic control for the detoxification of toxic Cr (VI)

preparation of potassium dichromate crystals from the

preparation of potassium dichromate crystals from the

In the present investigation, the oxidizing roasting process of chromite with sodium carbonate to prepare potassium dichromate crystals was studied in the microwave field with air, by heating the chromite and sodium carbonate. The chromite and sodium carbonate heated separately at 1000 C in the microwave oven (frequency: 2.45 GHz; power 1.5 kW) in order to study the microwave absorption

linkage between soil nutrient and microbial characteristic

linkage between soil nutrient and microbial characteristic

Jun 25, 2019 Soil organic matter (SOM) was determined by potassium dichromate oxidation titration. Total nitrogen (TN) was measured by the semi-micro Kjeldahl method. Total phosphorus (TP) was analyzed by molybdate colorimetric method after perchloric acid digestion and ascorbic acid reduction, and total potassium (TK) by the method of flame atomic absorption spectrophotometer ( Schneider

chromite ore - an overview | sciencedirect topics

chromite ore - an overview | sciencedirect topics

Sodium chromate and dichromate are produced by roasting chromite ore with soda ash and are the primary chromium salts from which most other chromium compounds are derived (ATSDR, 2000). Historical uses of chromium by major industry classifications are

soil properties and heavy metal concentrations affect the

soil properties and heavy metal concentrations affect the

Nov 01, 2020 The mining industry creates substantial economic benefits but causes ecological degradation in mining areas. During the process of restoring soil fertility in mining areas, the poor physical and chemical properties of the soil, such as its lack of soil OM, water, and nutrients and its high heavy metal contamination, become the main limiting

soil characteristics and microbial community response in

soil characteristics and microbial community response in

May 30, 2021 The soil of the study area is acidic, with a pH range of 4.374.75 (Fig. 2a), indicating that microorganisms in the rare earth mining areas possess a certain degree of acid resistance. The TOC content of site A is higher than that of other sites by an order of magnitude (Fig. 2a ): soil TOC content is 2.69% at site A, and that of the other

impacts of different land reclamation methods on organic

impacts of different land reclamation methods on organic

In this paper, changes in the amounts of organic carbon and black carbon in reclaimed soil were studied. The subsidence area was in a Xuzhou coal mining area that is part of a national land reclamation demonstration area. The significance of the paper is to explain the law of quality changes of reclaimed soil, improve the soil reclamation process and promote the sustainable use of soil in

analysis of plant and soil restoration process and degree

analysis of plant and soil restoration process and degree

Vegetation and soil restoration are the key to ecological reconstruction in the damaged areas of open-pit coal mining areas. Ecological stability is an important indicator of the degree of ecological restoration. In this study, the ecological stability and the process of plant and soil restoration were investigated at different refuse dumps in three coal mines, namely, the Wulanhada (WLHD

environmental risks of mining

environmental risks of mining

Mining is an inherently invasive process that can cause damage to a landscape in an area much larger than the mining site itself. The effects of this damage can continue years after a mine has shut down, including the addition to greenhouse gasses, death of flora and fauna, and erosion of land and habitat

how are diamonds mined and extracted from the ground

how are diamonds mined and extracted from the ground

Alluvial mining involves the building of walls and the diversion of rivers. Once the water is emptied out and prevented from flowing into the area of interest, bulldozers are then used to exploit the ground of the riverbank. Usually, kimberlite ore can be found in depths of at least 15 meters. When the diamond-rich depth is reached, the raw

mining operation: types, impacts and remedial measures

mining operation: types, impacts and remedial measures

Borehole process: Using a drill a deep hole is dug and a high pressure water-jet is used to force the materials up the hole. Sand, galena, gold etc. are mined by this process. Impacts of Mining: Mining is done to extract minerals from deep deposits in soil. Environmental damages caused by mining activities are as follows: 1

(pdf) the mine tailings as construction material in the

(pdf) the mine tailings as construction material in the

Erionite-K has been used as greater theoretical and practical knowledge about a noble-metal-doping catalyst in a hydrocarbon adobe haciendas mining, it is necessary to analyze cracking process and studied for its use in agricul- various samples from different mining districts and tural applications (i.e. in fertilizers and odor con- of

meeting of the national association of state land

meeting of the national association of state land

Meeting of the National Association of State Land Reclamationists Carbondale IL from BIOCHEM 2A at University of Johannesburg

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